The main pests and occurrence dynamics of open field cruciferous vegetables in the central region of Jilin Province were systematically investigated. The results showed that a total of 2 classes, 6 orders, 14 families and 26species of pests were investigated and identified in this area, and the species of Lepidoptera pests predominated in total, accounting for 57.69%, others were Hemiptera, Coleoptera, Diptera, Thysanoptera and Acari. The main pests seriously harmful to cruciferous vegetables in spring were Plutella xylostella, Pieris rapae and leaf miner, and the main pests in autumn were P. rapae and aphids. The occurrence peak of P. xylostella appeared from late June to early July. The P. rapa and P. xylostella occurred mixed, but the peak appeared in late August to early September.Aphids occurred seriously in the middle and late growth stages of cruciferous vegetable, and the peak reached in the middle of September. The number of leaf miner was large at the end of May, but decreased rapidly with the increase of temperature in June. The study provided a theoretical basis for the comprehensive management of cruciferous vegetables pests in Jilin Province.